#ifndef __UDP_SEVER_HPP__
#define __UDP_SEVER_HPP__

#include<iostream>
#include<string>
#include<memory>
#include<cstring>
#include<cerrno>
#include<strings.h>//bzero
#include<unistd.h>
#include<functional>

#include"InetAddr.hpp"
#include"Log.hpp"
#include"Common.hpp"

using namespace LogModule;
using namespace LogModule;

const static int gsockfd = -1;
const static uint16_t gdefaultport = 8080;
using func_t = std::function<std::string(const std::string&)>;

class UdpServer
{
public:
    UdpServer(func_t func,uint16_t port = gdefaultport)
        : _sockfd(gsockfd)
        ,_addr(port)
        ,_isrunning(false)
        ,_func(func)
    {}
    void InitS()
    {
        // 1. 创建socket
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0); 
        if (_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
            Die(SOCKET_ERR);
        }
        LOG(LogLevel::INFO) << "socket success, sockfd is : " << _sockfd;

        // 2. 填充网络信息，并bind绑定
        // 2.1 有没有把socket信息，设置进入内核中？？没有，只是填充了结构体！（在InetAddr中构造完成）
        

        // 2.2 bind ： 设置进入内核中
        int n = ::bind(_sockfd, _addr.NetAddr(), _addr.NetAddrLen());
        if (n < 0)
        {
            LOG(LogLevel::FATAL) << "bind: " << strerror(errno);
            Die(BIND_ERR);
        }
        LOG(LogLevel::INFO) << "bind success";
    }
    void Start()
    {
        _isrunning = true;
        while (true)
        {
            char inbuffer[1024]; // string
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer); // 必须设定

            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer) - 1, 0, CONV(&peer), &len);
            if (n > 0)
            {
                // 1. 收消息内容 && 2. 谁发给我的
                // InetAddr cli(peer);
                // inbuffer[n] = 0;

                // std::string clientinfo = cli.Ip() + ":" + std::to_string(cli.Port()) + " say#:  " + inbuffer;

                // LOG(LogLevel::DEBUG) << clientinfo;

                // std::string echo_string = "echo# ";
                // echo_string += inbuffer;

                inbuffer[n] = 0;

                //2.收到消息处理业务
                std::string result = _func(inbuffer);

                //3.发送处理好的消息
                ::sendto(_sockfd, result.c_str(), result.size(), 0, CONV(&peer), sizeof(peer));
            }
        }
        _isrunning = false;
    }
    ~UdpServer()
    {
        if(_sockfd > gsockfd)
            ::close(_sockfd);
    }

private:
    int _sockfd;
    InetAddr _addr;
    bool _isrunning; // 服务器运行状态
    func_t _func;    //业务
};

#endif